Acoustic instrument



c. KAHN. I ACOUSTIC INSTRUMENT.

APPLICATION FILED JULY I5, I92].

PatentedSept. 19, 1922.

Patented Sept. 19, 1922;

UNITED STATES CHARLES KAHN, OF

LONDON, ENGLAND.

ACOUSTIC INSTRUMENT.

Application filed July 15,

T 0 all whom it may concern Be it known that I, CHARLES KAHN, a subject of the King of Great Britain, residing at 30, Charing Cross Road, London, England, have invented new and useful Improvements in Acoustic Instruments (for which I have made applicationin Great Britain on July 15, 1919), of which the following is a specification.

My invention relates to an acoustic instrument consisting of a resonator or a pair of resonators, each of which is adapted closely to fit the head and ear of the wearer. In the resonator is a tapering tube, the large end of which is close to the back wall of the resonator casing.

According to my inventionthe small end of the tapering tube ends is connected to an angle piece to which is rotatably connected a second angle piece to which is rotatably connected an ear tube. Set screws may be provided to secure the second angle piece and ear tube in any desired position, but usually such set screws are unnecessary as I construct these parts with stifily engaging screws. 1 a I The accompanying'drawings show instruments made in accordance with my invention.

Figure 1 is a side elevation of a resonator with part of the casing and silk gauze removed and Figure 2 is a section on the line 2, 2, Figure 1. Figure 3 is a modification of Figure 1 in which the angle joints are inside the resonator casing. Figure 1 is a front elevation as seen when looking at the face of the wearer and with most ofthe silk gauze removed and Figure 5 a plan of an instrument consisting of two resonators coupled together.

a is the resonator casing having an elliptical opening closed by silk gauze b and within it a tapered tube 0 whose large end is close to the back Wall of the casing a. To

1921. Serial No. 484,865;

the back wall of the casing 61 may be secured by a screw 03 a sound reflector ev of glass. To the smaller end of the tube a is secured an angle piece f on which is rotatably mounted a second angle piece 9 and on this second angle piece 9 is rotatably mounted an ear tube It having an ivory tip 7' for entering the wearers ear. Set screws 70 and Z are provided for securing the second angle piece 9 and ear tube h in position. The provision of the angle pieces f and 9 allows of the adjustment of the ear tube It in all directions relatively to the tapering tube 0. The angle pieces f and 9 may be outside the wall of the resonator as shown in Figure 1 or within it as shown in Figure 3. When two resonators a are used they are connected together'by an adjustable spring coupling m which extends over the top of the head, and the-resonators a are located above and somewhat behind the ears of'the wearer, whilst the ivory tips j of the tube It enter his ears. When a single resonator is used a suitable pad is situated at the other end of the adjustable spring coupling m.

WVhat I claim is 1. 'An acoustic instrument consisting of a resonator casing, a taperingv tube in the casing, an angle piece at the end of the tapering tube, a second angle piece rotatably connected to the first and an ear tube rotatably connected to thesecond angle piece.

2. An acoustic instrument consisting of a resonator casing, a tapering tube in the casing, an angle piece at the end of the tapering tube, a second angle piece rotatably connected to the first, an ear tube rotatably connected to the second angle piece and set screws for securing the second angle piece and ear tube in position.

In testimony that I claim the foregoing as my invention I have signed my name this 23rd day of June 1921. j

CHARLES KAHN. 

